Nessus 3 Port Scanner Not Picking Up Open Ports

When using Nessus 3.x, either with nmap or without, it fails to pick up 
all open ports on a host even if the port_range variable is set to 
1-65535.  When nessus 2.x scans the same exact host, even with the 
port_range variable set to default, it picks up the open ports.  The 
specific example we have been using for our testing is psyBNC, but it is 
not currently throwing a banner.  Nessus 2.x is currently picking it up 
as being an unknown open port, but not psyBNC, because it is running on 
a non-standard port and has no banner (this is expected), however, 
Nessus 3 does not show the port as being open at all.

Is this the correct way in which Nessus 3 is supposed to work? (not 
showing a port unless it can grab a banner) If so, can we change this 
behavior?  If not, is there a setting we can check/change that may 
alleviate this problem?

Regards,

Kenneth Shelton
Incident Response Team
University of South Florida
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